Electric igniting devices for gas stoves or the like



H. ALEWELD July 28, 1959 ELECTRIC IGNITING DEVICES FOR GAS STOVES OR THELIKE Filed Nov. 21,1955

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ELECTRIC IGNITING DEVICES FOR GAS STOVES OR THE LIKE Filed Nov. 21, 19555 Sheets-Sheet a ELECTRIC IGNITING DEVICES FOR GAS STGVES OR THE LIKEHeinz Aleweld, Gelsenkirchen, Germany, assignor to Messrs. MetallwerkeGebr. Seppelfricke G.m.b.H., Gelsenkirchen, Germany, a German companyApplication November 21, 1955, Serial No. 547,972

7 Claims. (Cl. 158-115) Electric igniting devices for gas stoves or thelike with gas-regulating taps arranged in a row are already known, whichconsist of a magnetic apparatus producing hightension pulses bydisplacement of its iron core, and of a bar arranged behind thegas-regulating taps, which cooperates with the movement linkage of themagnetic apparatus and is displaced longitudinally, in each case onrotation of a gas-regulating tap, into the open position from the closedposition, by means of a drive member. Such igniting devices have thedisadvantage that after initiation of the ignition the rotary movementof the tap into all intermediate positions is not possible withouthindrance by the drive member.

By my present invention this drawback is successfully overcome in thecase of a gas stove with gas-regulating taps secured against unintendedopening, by novel means comprising a drive member constructed as aplunger firmly connected with the handle of the tap and movably mountedin an arm of the associated tap plug, the length of which plunger beingso dimensioned that its free end engages, on axial movement for releaseof the safety device of the tap handle, in a corresponding guide of saidbar, while in the case of relieved tap handles it releases the guide.

Thus, as already mentioned, the object is achieved that after initiationof the ignition and relief of the tap handle, the rotary movement of thetap into all intermediate positions is possible without hindrance by thedrive member.

According to-one form of embodiment of the object of my invention it isprovided that before or on reaching of the large-flame position of a taphandle, due to the cooperation of a radial securing pin of the taphandle with a stop shoulder in the tap-housing recess present for themovement of the securing pin, the rotation of the tap can only becontinued when the axial pressure upon the tap handle has been reducedso far that the securing pin can slide on before the stop shoulder.Thereby the bar is freed again of the elfect of the drive plunger.

In the case of a further form of embodiment of my invention thearrangement is made such that in the case of the use of centrallyignited stoves equipped with a centrally arranged ignition-jet head, anarm of the movement, linkage of the magnetic apparatus, in the pivotalmovement caused by the bar, by means of a sprung valve plunger of avalve arranged in the auxiliary gas conduit leading to the ignition jethead, briefly opens this valve, so that a quantity of gas under thepressure of the main gas conduit flows to the ignition jet head.

An example of embodiment is illustrated in the drawmg.

Figure 1 shows, in perspective, a gas stove, wherein the stove plate ishinged upwards and the casing and parts of the gas conduits are shownbroken away, in order to make the parts visible which are essential tothe invention.

Figure 2 shows the cooking stove according to Figure 1, in aview fromabove, and

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Figure 3 shows the magnetic apparatus for the production of high-tensionpulses, in cross-section.

Figure 4 shows a single burner with gas-regulating tap, in perspectiveand partially in section.

Figure 5 shows, in perspective, the installation of a safety valve withigniting flame and bimetal loop for the feeding of the forked burnertubes of the oven.

Figure 5a shows a horizontal section through the safety valve.

Figures 6, 6a and 7, 7a show, partially in section, the closed positionand large-flame position respectively of a gas-regulating tap and theassociated tap position, in front elevation.

Figures 8, 8a to 11, 11a show,in similar diagrammatic representations,the four positions of a gas-regulating tap and the different operationalconnections thereof with the movement linkage of the magnetic apparatusand of the valve of the auxiliary gas conduit.

In Figures 1 and 2 the gas stove is equipped with four burners 1 forfour cooking positions, which are grouped about a central ignition jethead 8, with which there cooperates a spark gap 9, which is charged withhigh-tension current pulses of about 5,000 volts. The ignition jet head8 is provided with four, jet apertures which are directed towards theindividual burners 1. In the region of one of the flame jets issuingfrom the jet apertures there is provided a strike-back tube 4e, whichissues from the oven burner 4a, 4a or the safety valve 4d of the latter(Figure 5). The ignition jet head 8 communicates with the main gasconduit 5 by means of the gas conduit 7. The auxiliary gas conduit 7 issupervised by a valve 6 with a valve plunger 6a under spring pressure,in such a manner that when the plunger 6a is moved against the action ofits spring by means of a lever 10a in the direction towards'the, valve6, the auxiliary gas conduit 7 is opened. The lever 10a lies in the pathof movement of the arm 10 with the journal 11. The latter acts with ashort arm 12 upon a helical spring 13 and the soft iron core 14 of themagnetic apparatus M (Figure 3), which is movable between two permanentmagnetic poles and influences a primary winding 17 and a secondarywinding 19. The primary winding can be interrupted by the switch 15, 16disposed in the range of movement of the soft iron core 14, whereby ahigh-tension current pulse is produced in the secondary winding 19, theone pole of which is connected to the spark gap 9 and. the other pole rof which is connected to earth. If under the action of the arm 10, 12the soft iron core 14 approaches its end position, it opens the switchcontacts 15 and 16 of the primary current circuit 17, the condenser 18of which then suppresses the occurrence of a spark between the contacts15 and 16.

The arm 10 of the movement linkage 10,11, 12 of the magnetic apparatus Mis connected by means of the draw rod 21 to one arm of the bell-cranklever 22, the other arm of which is articulated to a horizontallymovably mounted coupling bar 23 with a return spring 25. For each of thegas-regulating taps with handles there is provided in the coupling bar23 a guide slot 24, which lies in the range of movement of a plunger 26issuing from the handle 4 on a stem 40 of each gas-regulating tap 3,subject to spring pressure, and guided in one arm 27 of the rotatabletap plug (Figure 4). Each gas-regulating tap is secured in known manneragainst unintended opening by a radial pin 3b, which is guided in anaxial slot of the tap housing. This axial slot opens into a peripheralslot 3:: of the tap housing, which permits the rotation of the tap whenthe tap handle 4, which is under spring actionphas first been movedaxially inwards by an appropriate amount. On this axial inward movementof the tap handle 4 in the direction of the arrow A (Figure 4) theplunger26 is caused to follow, and enters pressure upon the tap handle 4is released, then the pin 3b moves axially back, until it becomes freeof the stop shoulder 30, and then can be moved back and forth at willbetween large-flame position T and economy flame position U. Since onthe axial return movement of the tap handle 4 the plunger 26 has alsoreturned, the coupling bar 23 is withdrawn from the action of theplunger and can therefore return into the initial position, followingthe action of the springs 25 and 13, and then drive the angle member 22,the draw-rod 21 and the arm 10, 12 which is then situated again in theposition according to Figures 1 and 3. If finally the tap handle 4 isreturned to the closure position, then the pin 3b comes, through anadditional axial movement, into a recess of the tap housing, in which itis again blocked against unintended rotation.

Figures 8, 8a to 11, 11a show diagrammatically various positions of thetap handle 4 for the setting in operation of a single cooking point,each different position of the tap handle 4 being represented again in afront elevation (8a) beside the plan view. Figure 8 shows the closedposition S of the tap handle 4 .with its drive plunger 26. In Figure9the tap handle 4 is moved axially inwards under the actionof its springx (Figures 6, 7), until the pin 3b abuts against the rear wall of therecess 3a of the tap housing and the drive plunger 26 has entered theguide slot 24 of the coupling bar 23. The tap handle 4 can now berotated in the direction towards the large-flame position T. It heretakes with itthe horizontally displaceable coupling bar 23 against theaction of the spring 25 (Figure 1) and causes, through the bellcranklever 22 and the draw-rod 21, a pivoting ofthe two-armed lever 10, 12against the actionof the spring 13 of the magnetic apparatus M. Thelevera participates in thispivotal movement, opens the valve ,6 of theauxiliary gas conduit '7, and sends a current of gas intothe ignition.jet head 8. At the same time the soft iron core 14- is moved axially,abutting against the spring of the contact 15, removes the latter fromthe contact 16 and thereby interrupts the current circuit of the ,pri-

mary winding 17 of the magnetic apparatus M, which has the result thatin thesecondary winding 19 -a hightension current .pulse occurs, whichbridges over the spark gap 9. Four ignition flame jets are produced,which are indicated in Figure 2. Only theburner 1, the tap 3 of whichhas been opened, is ignited. .The rotation of the tap handle 4 in thedirection towards the large-flame position T suffers an interruptionatone point, due to the fact that the-pin 3b of the tapv handle 4 abutsagainst the wall3c, within the recess 3a ofthe tap housing. If now theaxial pressure exerted upon the tap handle 4 is released, the taphandle-follows the action of its spring and returns axially, whereuponthe handle 4 can be displaced freely between the large-flame position'Tand the economy flame position U. Due to the axial return of the taphandle the plunger 26 is drawn outof the associated slot 24 of thecoupling bar 23, which has the result that the latter can return intothe horizontal'initial position under the action of its. spring 25. Thebell-crank lever 22, the draw-rod 21 and the two-armed lever 10,12participate in this return movement, their return pivotal movement beingsupported by the de-tensioning of the helical spring 13 .ofthe magneticapparatus M. The 'soft iron core l t here also returns into the positionas shown in Figure 3, and in which .the contacts 15, loagain close thecurrent circuit of 'the primarywinding ll. In .thepcase ofievery othergas-regulating tap the deflame jets of the ignition jet head 3 (Figure2).

, 4 p scribed operational movements of the linkage connection betweentap handle 4 with plunger 26 on the one hand and the auxiliary gas valve6 and magnetic apparatus M on the other hand are repeated. Each time across of flame jets, as indicated in Figure 2, is produced between theignition flame head 8 and the four burner heads. 1.

The fifth tap handle 4b which may be seen from Figure 1 supervises thegas supply to the forked tube 4a, 4a beneath the oven, which is notillustrated separately, by means of the gas conduit 4c, into which thereis also inserted a safety valve id with an ignition flame 4g and abimetal spring 4h disposed in the region of this ignition flame 4g andsupervising the valve plunger 4i (Figures 5 and 5a). This safety valve4d has the purpose, in the case of ignition failures, of preventing theinflow of unignited gas into the burner tubes 4a, 4a and thence into theburner space beneath the oven. The ignition flame 4g of the safety valve4d is ignited by means of a strike-back pipe 4e, which opens above thesplash plate F (Figure l) in the region of one of the In order toprevent the ignition spark from jumping over before the gas has flowedthrough the strike-back pipe 4e from bottom to top, the handle ofthisgas-regulating tap14b is preferably connected to its stem by asuitable spring detent, which causes the stem to turn afterrotation ofthe tap handle through about 45. If the further rotation of the tap 4bis delayed in this position for about 10 seconds, then the ignitionflame gas flowing out from the opened safety valve 4d receives anopportunity to rise in the strike-back pipe 4e. If the tap handle isthen rotated further so as to rotate the stem through the medium of thespring detent, then the gas has meanwhile reached the upper opening ofthe. strikeback pipe 4e and ignites, when the spark gap is bridged over;by the high-tension pulse initiated at the same time. Otherwise thisfifthgas-regulating tap 4b differs in no way from the other fourgas-regulating taps. This tap also can be shifted freely betweenlarge-flame position T and economy-flame position U withoutparticipation of the coupling linkage, after the ignition.

I claim; 7

1. In a gas stove or thelike, the combination of a burner, a gasregulating tap therefor, a gas conduit extending from said tap to saidburner, said tap injcluding an actuating stern slidable axially from aninitial nonrotatable position toa second position wherein it maybero-tated between fully closed and fully open settings through anintermediate position wherein it may be rotatcdto adjust the burnerflame, a self-contained mag netic induction apparatus having a hightension spark gapdisposed adjacent said burner and including a slidableactuating core, a secondary conduit for delivering gas to said sparkgap, an actuating bar slidable transversely to the axis of the stern ofsaid tap and operatively connected to said core, andmeans carried by,said stern and operatively engageable with said'bar only when the stemis slid to its second position for sliding the bar,

by rotation of the stem, whereby the stem whenin its intermediateposition may be rotated to adjust the burner flame without sliding saidbar.

2. The combination as defined in claim 1 together with normally closedvalve meansprovided on saidsecondary conduit, and means operativelyconnecting said valve means to said bar for opening the same :When thebar is slid.

3. The combination as defined in claim 1 wherein said last mentionedmeans comprise a plunger parallel with and rigidly secured to said stemat one end thereof and having a free other end, said bar being providedwith a slot adapted to receive the free end portion of said plunger andsaid plunger being of such length as to enter said slot only when saidstem is slid to its second position.

4. In a gas stove or the like, the combination of a burner, a gasregulating tap therefor, a gas conduit ex= tending from said tap to saidburner, said tap including an actuating stem slidable axially from aninitial nonrotatable position to a second position wherein it may berotated between fully closed and fully open settings through anintermediate position wherein it may be rotated to adjust the burnerflame, a self contained mag netic induction apparatus having a hightension spark gap disposed adjacent said burner and including a slidableactuating core, a secondary conduit for delivering gas to said sparkgap, normally closed valve means provided on said secondary conduit, alongitudinally slidable actuating bar disposed transversely to the aXisof the stem of said tap, resilient means urging said bar in onedirection, means responsive to sliding of said bar in the oppositedirection for sliding the core of said induction apparatus and openingsaid normally closed valve means, and means responsive to rotation ofsaid stern for sliding said bar in said opposite direction, said lastmentioned means comprising a plunger parallel with and secured at oneend thereof to said stem and having a free other end, said bar beingprovided with a slot adapted to receive the free end portion of theplunger and said plunger being of such length as to enter said slot onlywhen said stem is slid to its second position, whereby the stem when inits intermediate position may be rotated to adjust the burner flamewithout sliding said bar.

5. The combination as defined in claim 4 together with resilient meansfor urging said stem to its initial nonrotatable position.

6. In a gas stove or the like, the combination of a burner, a gasregulating tap therefor, a gas conduit extending from said tap to saidburner, means for igniting gas at the burner, said last mentioned meansincluding a slidable actuating element, and means responsive to actuation of said tap for energizing said last mentioned means, said tapincluding an actuating stem slidable axially from an initialnon-rotatable position to a second position wherein it may be rotatedbetween fully closed and fully open settings through an intermediateposition wherein it may be rotated to adjust the burner flame, a stopfor said stem at its fully open setting, said stop being eliective onlywhen the stem is in its second position, a handle rigidly secured to thestem, and resilient means for urging the stem to its initialnon-rotatable position, said means for energizing the gas igniting meanscomprising a longitudinally slidable actuating bar disposed transverselyto the axis of said stern and provided with a slot extendingtransversely of the bar, means operatively connecting said bar to saidactuating element of the gas igniting means whereby said element may heslid to energize the gas igniting means in response to sliding of thebar in one direction, resilient means for sliding said bar in theopposite direction, and a plunger parallel with said stem and secured atone end thereof to said handle, said plunger having a free other endreceivable in the slot of said bar and being of such length as to entersaid slot only when said stem is slid to its second position wherein thebar may be slid to energize said gas igniting means by operativeengagement of the free end portion of said plunger with a side edge ofsaid slot during rotation of said stem toward said stop when the stem isin its second position, said stem being rotatable to adjust the burnerflame Without sliding said bar when the stem is in its intermediateposition.

7. In a gas stove vor the like, the combination of a plurality ofburners, a plurality of gas regulating taps for the respective burners,gas conduits extending from said burners to the respective taps, acommon gas igniting head for said burners, a self-contained magneticinduction apparatus having a high tension spark gap at said head andincluding a slidable actuating core, a secondary conduit for deliveringgas to the spark gap at said head, a normally closed valve on saidsecondary conduit, each of said taps including an actuating stemslidable axially from an initial non-rotatable position to a secondposition wherein it may be rotated between fully closed and fully opensettings through an intermediate position wherein it may be rotated toadjust the burner flame, a longitudinally slidable actuating bardisposed adjacent said taps transversely to the axes of the stemsthereof and provided with slots adjacent the respective taps, meansresponsive to sliding of said bar in one direction for opening saidvalve and energizing said induction apparatus, resilient means forsliding said bar in the opposite direction, and a plurality orf plungersparallel with and secured at one end thereof to the stems of therespective taps, each plunger having a free end and being of such lengthas to permit entry of its free end portion into an adjacent slot in saidbar only when the associated stem is slid to its second position wherebyto energize said induction apparatus and open said valve by sliding ofthe bar during rotation of the associated stem in the second position ofthe latter, but whereby the stems of the respective taps may beindependently and individually rotated to adjust the burner flameswithout sliding said bar when in their intermediate positions.

References Cited in the file of this patent UNITED STATES PATENTS1,488,975 Brown Apr. 1, 1924 1,600,857 Woods Sept. 21, 1926 1,894,006Rossi et al. Jan. 10, 1933 2,250,356 Brumba-ugh July 22, 1941 2,520,608Minnich Aug. 29, 1950 FOREIGN PATENTS 511,005 Belgium May 15, 1952

